(1) Tested Strong Shield 6W4GT Tube Shield 6W4 GT Half Wave Rectifier Tube

(1) Tested CBS 6W4GT Tube Date Code CN CBS 6W4 GT Half Wave Rectifier

Vintage Tested Good Zenith 6W4GT Half Wave Rectifier Vacuum Tube

Vintage Tested Good GE 6W4GT Half Wave Rectifier Vacuum Tube

Vintage Tested Good Tung-Sol 6W4GT Half Wave Rectifier Vacuum Tube

Vintage Tested Good Channel Master 6W4GT Half Wave Rectifier Vacuum Tube

(1) Tested Strong CBS 6W4GT Tube CBS 6W4 GT Half Wave Rectifier Tube

(1) Tested RCA 6W4GT Tube Date Code 522 RCA 6W4 GT Half Wave Rectifier